Blank duct plug

Abstract

A pipe plug is disclosed which includes a disc-like screw plate, an elastic sealing ring, a horn-like pressure block, and a lifting eye. The screw plate receives the bottom edge of the sealing ring and the horn-like pressure block is mounted on the upper edge. The screw plate has a central rod that extends upwardly through a hole in the pressure block. The lifting eye is then threadedly received on the end of the rod and as the lifting eye is turned, the block and plate will be urged together causing the sealing ring to expand against the internal wall of a pipe.

What is claimed is: 
     
       1. A pipe plug comprising: a disc-like bottom block having a rod coaxially extending from an upper surface thereof and having a circular groove extending around the periphery of said block along the upper surface, said rod having a threaded upper portion;   an elastic sealing ring having a lower beveled edge received in the circular groove of said block;   a horn-like pressure block having an upper plate-like surface and a lower surface of lesser diameter forming an L-shaped groove around the periphery of said lower surface, the upper surface of said sealing ring being received in said groove in said horn-like pressure block, said block also having an axial hole therethrough receiving the upper portion of said rod, said pressure block further forming reinforcing ribs on the lower surface thereof integrally with said block and extending radially from the center hole to the periphery of said block and two pintle hooks set in the lower surface at the center hole, said hooks being dimensioned to be pushed open by the threaded portion of said rod as it is pushed through the center hole and to engage the smooth lower portion of said rod;   a lifting eye having an internal threaded portion dimensioned to receive the threaded end of said rod so that as the eye is screwed downwardly onto the rod, the horn-like pressure block and the disc-like bottom block will be drawn together causing the elastic ring to expand.